<template>
  <el-container>
    <!-- 头部 -->
    <el-header>
      <div>
        <img src="../assets/logo.png" alt />
        <span>碳积分运营管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="togleCollapse">|||</div>
        <el-menu unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath" background-color="#333744" text-color="#fff" active-text-color="#409FFF">
          <!-- :unique-opened="true"->只允许展开一个菜单 -->
          <!-- :collapse-transition="false" -> 关闭动画 -->
          <!-- router -> 导航开启路由模式 -->
          <!-- 一级菜单  -->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id" >
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <i :class="iconObj[item.id]"></i>
              <span>{{ item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
              <!-- 导航开启路由模式：
                将index值作为导航路由 -->
              <!-- 二级菜单的模板区域 -->
              <template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{ subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 内容主体 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
  import Bus from '../util/bus.js'
  export default {
    mounted() {
      // 监听此事件
      Bus.$on('changetoUser', e => {
        this.activePath = window.sessionStorage.getItem('activePath')
      })
      // 监听此事件
      Bus.$on('changetoExchange', e => {
        this.activePath = window.sessionStorage.getItem('activePath')
      })
      // 监听此事件
      Bus.$on('changetoTrip', e => {
        this.activePath = window.sessionStorage.getItem('activePath')
      })
    },
    data () {
      return {
        // 左侧菜单数据
        menuList: [],
        iconObj: {
          '103': 'iconfont icon-tijikongjian',
          '101': 'iconfont icon-shangpin',
          '102': 'iconfont icon-danju',
          '145': 'iconfont icon-baobiao',
          '125': 'iconfont icon-user'
        },
        // 默认不折叠
        isCollapse: false,
        // 被激活导航地址
        activePath: ''
      }
    },
    created () {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
      async logout() {
        // 清空token
        const { data: res } = await this.$http.post('logout')
        console.log("logout res"+res.meta.status)
        if (res.meta.status !== 200) return this.$message.error('登出失败！')
        this.$message.success('登出成功')
        this.$router.push('/login')
      },
      // 获取请求菜单
      async getMenuList () {
        const { data: res } = await this.$http.get('menus')
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menuList = res.data
        console.log(res)
      },
      // 菜单的折叠与展开
      togleCollapse () {
        this.isCollapse = !this.isCollapse
      },
      // 保存连接的激活地址
      saveNavState (activePath) {
        window.sessionStorage.setItem('activePath', activePath)
        this.activePath = window.sessionStorage.getItem('activePath')
      }
    }
  }
</script>

<style lang="less" scoped>
  .el-container {
    height: 100%;
  }
  .el-header {
    background-color: #373f41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      img {
        height: 40px;
      }
      span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #333744;

    .el-menu {
      border: none;
    }
  }
  .el-main {
    background-color: #eaedf1;
  }
  .iconfont{
    margin-right: 10px;
  }
  .toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    // 鼠标放上去变成小手
    cursor: pointer;
  }
</style>
